Joint binder



March 13, 1928. 1,662,573

E. c. GLARDON JOINT BINDER Filed June 22, 1927 Patented Mar. 13, 1928.

UNITED-STATES 1,662,573 PATENT OFFICE.

EDOUARD CHARLES GLAR DON, OF LAUSANNE SVIITZERLAND.

JOINT BINDER.

Application filed June 22. 1927, Serial No. 200,712, and in Germany May 28, 1925.

The present invention relates to improvements connected with joint binders, such as are used for binding together wooden planks, boards and the like and especially 7 for securing the lids or covers on chests and boxes to safeguard the contents of the lat* ter against pilfering and fraudulent access being had thereto. More particularly the in vention relates to that known class of joint binders, which consists of a U-shaped safety clamp, the perforated shanks of which are to be driven into the two parts to be secured together, and. of a flat barbed nail which is driven into the said two parts and through the perforations of the shanks until its head is countersunk in one of those parts, to prevent the clamp from being withdrawn without leaving evidence that it had been tampered with.

The fiat nails hitherto used in connection with joint binders of the class referred to do not afford a reliable protection against the withdrawal of the clamps, for the reason that it is possible to drive such nailscompletely through both shanks of the clamps, thus liberating the clamps and enabling same to be withdrawn and to be reinserted without noticeable traces.

In order to render effective the protection aimed at by the use of the aforesaid U shaped safety clamps and the fiat barbed nails in connection therewith, means must be provided by which it is rendered impossible to drive the flat barbed nails completely through bothshanks of the clamps.

According to the present invention these means consists in a re-inforoement for the edge portions of the perforations of the shanks, adapted to prevent the head of the fiat barbed nail, situated in these perforations, cutting its way through the edge portions even if the nail receives hard and sud den blows in the attempt todrive same completely through both shanks of the clamps.

In the annexed drawing are shown, by way of example, several modes of carrying into practice this invention.

Figure 1 is a central vertical section of an ordinary U-shaped safety clamp as commonly in use,

Figure 2 is a plan view of Figure 1,

Figure 3 shows a joint binder of the nature described employing a U-shaped safety clamp such as indicated in Figures 1 and ,2 for eonnecting the lid with the body of a Figure 4: is a central vertical improved U-shaped safety clamp,

Figure 5 is a plan view of Figure 4-. y

Figure 6 is a central vertical section of section of the a modification ofjthe improved U-shaped safety clamp,

Figure 7 is a plan view of Figure 6, Figure 8 is a central vertical section of another modification of the improved U- shaped safety clamp, and v Figure 9 is a plan view of Figure 8, Figure 10 is a central vertical section of another modification of the improved U- shaped safety clamp, and Figure 11 is a planviewof Figure 10. The joint binder employs in the usual manner a U-shaped clamp consisting of two shanks Z c, which are interconnected by the web a and which are each provided with a perforation (Z and 6 respectively. This clamp with its shanks b, c, is to be driven into the two parts A, B to be safeguarded in their connection as indicated in Figure 3 and subsequently a flat barbed nail G is to be driven into the two parts A, B so as to take up its position in the perforations of the shanks b, c, as indicated in Figure 3.

The re-inforcement for the edge portions of the perforations d, e in'the shanks Z2, 0, may be conveniently formedby portions of the shank metal cut in forming the perforations being bent to form a ridge or flange along said edge portions. in the arrange ment shown in Figures 4 and 5 the shank metal at the margins of the perforations is turned'inwardly forming ridges or flanges (Z and 6 respectively, which extend about F double the thickness of the sheet metal employed in the production of the clamp.

The modification in the re-inforcement of the edge portion of the perforations d, e in the shanks b, 0, which is illustrated in Figures 6 and 7, differs from the arrangement according to Figures 4 and 5 in that the shank metal at the edges of the perforations is completely turned into the ridge or flange, so that the edge portion of the perforations d, e, is doubledin thickness as indicated by the reference letters (Z and 6 respectively.

According to Figures 8 and 9 the perf01ations cl, 6 in the shanks b, c and the re-inforcement of their edge portion are obtained by employing a punch which instead of cutting a clean hole, merely pierces the shanks b, a at the meeting point of crossing slits. In so piercing the shanks the" metal sev HIU ered by the crossing slits: is turned, forming triangular prongs and a respectively, said prongs. by completely turning them, doubling the edge portion of the perforations a. 0 similar to the bordering of the edge portion oi the perforations (l and 0 as shown in l igures ti and 7.

By previousl providing eroti-sing slits in the shanks Z). c at. the places where the perforations (I, a are to be situated the i'orlnation of the prongs d and 0 respectively takes place in the required arrangement, so that the tlatbarbed nail in being driven home into the clamp is sure to face with its lateral edges the re-in'orced ed 'e portions of the perforations d, 1'.

To produce the crossing; slits in the shanks Z). (a the punch employed in piercing the latter may be provided with radial cutting edges.

The modification in the re-in'l'oreement of the edge portion of the perlorations (I. o in the shanks o. e, which is illustrated in Figures ltl and 11 employs annular eyelet-- f bordering the edge portion of the perl'orations as shown.

By re-intorcing the edge portion of the perforations in the shanks 7). c in the manner described with reference to the several titrures, the ordinary flat barbed nail t. whicl forms an accessory part of the U-rhaped clamp. the largest dimension ol' which. at the head portion. exceeds the diameter of the perforations, cannot cut its way. through the edge portions of the pertorations. so that it is impossible to completely drive the nail through both shanks ot the clamp.

It is to be understood that. the constructional forms illustrated in the drawings are given merely as an example. and that modi' tications may be made according to require ments inithe construction and in the sizes of the respective parts Without departing from the essential "Features of the invention.

Having described my invention, I declare and desire to :ecure by rated and adapted to enter the two membersi to be secured together. a tlat barbed nail adapted to be driven into the said two mem hers and through the perforations ot' the shanks, and a re-int'orccment for the edge. portions of the pertorationain the shanks adapted to prevent the head oi" the tlat barbed nail being' driven through the edge portions.

2. A joint binder comprising a U-shaped clamp, the two shanks ot which are per orated and adapted to enter the two in' tubers to be secured together. a ilat barbed nail adapted to be driven into the raid two members and through the perl'oratir-in' ol' the shanks, and a reintorcenu-nt tor the ede'" portions of the perforations in the shanks adapted to prevent the h ad of the flat barbed nail being! driven through the edgr portions. said re-int'orcenu-nt ronviutim; oi portions ot the shank metal cut in Forming: the perforations bent to form ridgealong said edge portions.

3. A ioint binder comprising: a. U-shaped clamp. the two shanks of which are pert'orated and adapted to enter the two members to be secured together. a flat barbed nail adapted to be driven into the mid two members and through the perforations o the shanks. and a re-inlorcement tor the edge portions of the pert'orations in the shank; adapted to prevent the head of the flat barbed nail being driven through the edge portions. said re-iniorcement consisting of bent over triangular portions of the shank metal bordering the perforati ns and term d by cutting crossing: slits in said shank.

In testimony whereof. I have atlixed my signature hereto.

EDOUARD CHARL CS tltl'Altl'JON. 

